Archean continental crust formed by magma hybridization and voluminous partial melting

Abstract Archean (4.0–2.5 Ga) tonalite–trondhjemite–granodiorite (TTG) terranes represent fragments of Earth’s first continents that formed via high-grade metamorphism and partial melting of hydrated basaltic crust. While a range of geodynamic regimes can explain the production of TTG magmas, the pr...

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Autores principales:	Juan David Hernández-Montenegro, Richard M. Palin, Carlos A. Zuluaga, David Hernández-Uribe
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3889d110786b47dda127f9f97a228dc8
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spelling	oai:doaj.org-article:3889d110786b47dda127f9f97a228dc82021-12-02T11:35:57ZArchean continental crust formed by magma hybridization and voluminous partial melting10.1038/s41598-021-84300-y2045-2322https://doaj.org/article/3889d110786b47dda127f9f97a228dc82021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84300-yhttps://doaj.org/toc/2045-2322Abstract Archean (4.0–2.5 Ga) tonalite–trondhjemite–granodiorite (TTG) terranes represent fragments of Earth’s first continents that formed via high-grade metamorphism and partial melting of hydrated basaltic crust. While a range of geodynamic regimes can explain the production of TTG magmas, the processes by which they separated from their source and acquired distinctive geochemical signatures remain uncertain. This limits our understanding of how the continental crust internally differentiates, which in turn controls its potential for long-term stabilization as cratonic nuclei. Here, we show via petrological modeling that hydrous Archean mafic crust metamorphosed in a non-plate tectonic regime produces individual pulses of magma with major-, minor-, and trace-element signatures resembling—but not always matching—natural Archean TTGs. Critically, magma hybridization due to co-mingling and accumulation of multiple melt fractions during ascent through the overlying crust eliminates geochemical discrepancies identified when assuming that TTGs formed via crystallization of discrete melt pulses. We posit that much Archean continental crust is made of hybrid magmas that represent up to ~ 40 vol% of partial melts produced along thermal gradients of 50–100 °C/kbar, characteristic of overthickened mafic Archean crust at the head of a mantle plume, crustal overturns, or lithospheric peels.Juan David Hernández-MontenegroRichard M. PalinCarlos A. ZuluagaDavid Hernández-UribeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Juan David Hernández-Montenegro Richard M. Palin Carlos A. Zuluaga David Hernández-Uribe Archean continental crust formed by magma hybridization and voluminous partial melting
description	Abstract Archean (4.0–2.5 Ga) tonalite–trondhjemite–granodiorite (TTG) terranes represent fragments of Earth’s first continents that formed via high-grade metamorphism and partial melting of hydrated basaltic crust. While a range of geodynamic regimes can explain the production of TTG magmas, the processes by which they separated from their source and acquired distinctive geochemical signatures remain uncertain. This limits our understanding of how the continental crust internally differentiates, which in turn controls its potential for long-term stabilization as cratonic nuclei. Here, we show via petrological modeling that hydrous Archean mafic crust metamorphosed in a non-plate tectonic regime produces individual pulses of magma with major-, minor-, and trace-element signatures resembling—but not always matching—natural Archean TTGs. Critically, magma hybridization due to co-mingling and accumulation of multiple melt fractions during ascent through the overlying crust eliminates geochemical discrepancies identified when assuming that TTGs formed via crystallization of discrete melt pulses. We posit that much Archean continental crust is made of hybrid magmas that represent up to ~ 40 vol% of partial melts produced along thermal gradients of 50–100 °C/kbar, characteristic of overthickened mafic Archean crust at the head of a mantle plume, crustal overturns, or lithospheric peels.
format	article
author	Juan David Hernández-Montenegro Richard M. Palin Carlos A. Zuluaga David Hernández-Uribe
author_facet	Juan David Hernández-Montenegro Richard M. Palin Carlos A. Zuluaga David Hernández-Uribe
author_sort	Juan David Hernández-Montenegro
title	Archean continental crust formed by magma hybridization and voluminous partial melting
title_short	Archean continental crust formed by magma hybridization and voluminous partial melting
title_full	Archean continental crust formed by magma hybridization and voluminous partial melting
title_fullStr	Archean continental crust formed by magma hybridization and voluminous partial melting
title_full_unstemmed	Archean continental crust formed by magma hybridization and voluminous partial melting
title_sort	archean continental crust formed by magma hybridization and voluminous partial melting
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3889d110786b47dda127f9f97a228dc8
work_keys_str_mv	AT juandavidhernandezmontenegro archeancontinentalcrustformedbymagmahybridizationandvoluminouspartialmelting AT richardmpalin archeancontinentalcrustformedbymagmahybridizationandvoluminouspartialmelting AT carlosazuluaga archeancontinentalcrustformedbymagmahybridizationandvoluminouspartialmelting AT davidhernandezuribe archeancontinentalcrustformedbymagmahybridizationandvoluminouspartialmelting
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Archean continental crust formed by magma hybridization and voluminous partial melting

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